Tube-mandrel.



I J. R. HARBEGK.

PATENTED my. 5, 19.07

TUBE MANDREL. A PPLIU AT IDK FILED MAY 27, 1907.

inventorg' gmk w As, 7

V witnesses UNITED STATES P grnn'r ornron.

.JERVIS Rs'HARBECK, or DETROIT, MICHIGAN-,,;ASSIGNUR 'ro KEMIWELDCAN COMPANY,

or DETROIT, MICHIGAN, A CORPORA ION OF MICHIGAN.

'TUYBE-MANDREL.

To all whom it may concern: I

Be it known that I, .lnnvrs Rdhns'ncx, a citizen of the United States, and a resident of Detroit, in the county of Wayne and State of Michigan have invented a new and useful Tube-Mand rehoi which the following is a specification.

My invention relates to mandrels upon which sheets or hands of paper or other fibrous material may be wound for forming tubes, and consists in mandrelswhich are longitudinally grooved so as to form co1'rugated surfaces.

In the accompanying drawings, Figure l is a view of a corrugated mandrel and stripping sleeye' 2' is a transverse cross section of the mandrel. Fig. 3 is a transverse cross section of the mandrel and sleeve. Figs. 4 and 5 are transverse sections of other iormsof .mandrels. I

Similar reference characters refer to like parts.

throughout the several views. I

Winding mandrels are generally so constructed that the forward edge of the sheet of tube material or the front end of the band of such material is held against the mandrel either by suction, through the action of an air pump, or a gripper The revolving mandneLthen turns and winds the tube material upon itself. As thismaterial is generally coated with liquid glue and has therefore expanded, it usually contracts to a certain extent. immediately upon being wound, thus causing the finished tube to grip the mandrel. .I have found that injured this grip is so strong that the tubes are often when they are pushed otithe mandrel.

Specification of Letters Patent. Application filed May 27, 1907. Serial No. 375.791.

. Patented Nov; 5, 190% To reduce the 'frictional area- I form longitudinal grooves '1 in the mandrelfi. I have also .found that where a cylindrical sleeve slides over a cylindrical mandrel, the edge of one ormore wraps of the tube material is liable to become wedged in between the sleeve and mandrel. To prevent this, I. form the sleeve '11 with teeth 5 which fit the grooves l. With such construction, it is impossible for the material 3 to get between the mandrel and sleeve excepting where the mandrel is not grooved, such, as the portion 6 havingthe suction i holes 7 but this space is so short thai'the trouble is immaterial.

{ "In Fig. 5 I have shown a generally rectangular mandrel 8 having-grooves Wand a sleeve 10 having teeth ll .to'fit the-grooves. g 'In Fig. 4,;the edge of thejtube material instead of being had by air prcssure, is gripped by the clamp 13 mountedon the pin 14. The mandrel 15 has grooves- Jnnvis R. HARBECK.

Witnesses y K. WHITE, Jrz', EDWARD N. PAGELSEN. 

